A current mode switching regulator with optimized loop response, providing fast load transient response is proposed in this paper. Unlike conventional current mode control where the pole zero cancelation technique is used in the compensation design, the proposed system move the compensation zero to a higher frequency to achieve a higher loop gain in a fixed loop bandwidth. The higher loop gain can lead to a smaller closed-loop line-to-output and output impedance, which in other word, the proposed optimized loop response dc-dc converter can serve better line and load transient response. The measurement results show that this converter can operate with load current from 200 to 500 mA in a supply voltage from 2.7 to 4.2 V and the output voltage of 1.8V. The recovery time is about 10us and the highest efficiency is 93%. This converter is designed and fabricated with TSMC 2P4M 0.35μm CMOS process.
{"title":"Fast transient current mode dc-dc converter with optimized loop response","authors":"Chi-Yuan Huang, Kai-Yu Hu, Shih-Mei Lin, Chien-Hung Tsai","doi":"10.1109/IFEEC.2015.7361526","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361526","url":null,"abstract":"A current mode switching regulator with optimized loop response, providing fast load transient response is proposed in this paper. Unlike conventional current mode control where the pole zero cancelation technique is used in the compensation design, the proposed system move the compensation zero to a higher frequency to achieve a higher loop gain in a fixed loop bandwidth. The higher loop gain can lead to a smaller closed-loop line-to-output and output impedance, which in other word, the proposed optimized loop response dc-dc converter can serve better line and load transient response. The measurement results show that this converter can operate with load current from 200 to 500 mA in a supply voltage from 2.7 to 4.2 V and the output voltage of 1.8V. The recovery time is about 10us and the highest efficiency is 93%. This converter is designed and fabricated with TSMC 2P4M 0.35μm CMOS process.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131756456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/IFEEC.2015.7361497
Duy-Hung Dam, Hong‐Hee Lee, Heung-Geun Kim
A nonlinear load generally causes harmonic distortion, and harmfully affects the performance of other loads or other distributed generation (DG) sources connected to the point of common coupling (PCC). This paper proposed a new control strategy to reduce harmonic components such as fifth and seventh harmonics at the PCC under nonlinear load in the islanded microgrid which includes more than two DG sources. The DG source operated with the proposed control scheme has ability to share the power commanded by the control center as well as to compensate the harmonic components voltage at PCC. The control scheme is developed based on the current controller composed of the resonant controller and a proportional integral controller. Because the reference current is estimated from the voltage harmonic and the injecting power, the control scheme is implemented without any additional hardware devices. The simulation and experimental results are given to verify the effectiveness of the proposed control method.
{"title":"Effective output voltage quality control under nonlinear loads in islanded microgrid","authors":"Duy-Hung Dam, Hong‐Hee Lee, Heung-Geun Kim","doi":"10.1109/IFEEC.2015.7361497","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361497","url":null,"abstract":"A nonlinear load generally causes harmonic distortion, and harmfully affects the performance of other loads or other distributed generation (DG) sources connected to the point of common coupling (PCC). This paper proposed a new control strategy to reduce harmonic components such as fifth and seventh harmonics at the PCC under nonlinear load in the islanded microgrid which includes more than two DG sources. The DG source operated with the proposed control scheme has ability to share the power commanded by the control center as well as to compensate the harmonic components voltage at PCC. The control scheme is developed based on the current controller composed of the resonant controller and a proportional integral controller. Because the reference current is estimated from the voltage harmonic and the injecting power, the control scheme is implemented without any additional hardware devices. The simulation and experimental results are given to verify the effectiveness of the proposed control method.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121420596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/IFEEC.2015.7361453
Takahiro Uehara, Noor Ahmad Samim, T. Senjyu, M. Datta
Recently, penetration of renewable energy sources is remarkable. However, it causes system frequency deviation that means decrease of system reliability. In order to solve this problem, this paper proposes frequency control method using demand response (DR) and suppression of power output for renewable energy sources. It is assume that the consumption power of end-user is controlled automatically by smart appliances that decides the switch on/off using electric price. The electric price is given by real-time pricing method which is one of the DR methods. In addition, the suppression of power output for Photovoltaic Generator (PV) and Wind Generator (WG) is introduced. The suppression of power output for PV has been performed by controlling operating point, and that for WG is performed by controlling the pitch-angle of the blade. Furthermore, battery which has fast response characteristic is used, because the DR has slow response characteristic due to communication delay and mechanical delay. The effectiveness of the proposed method is verified by computer simulations.
{"title":"Real-time pricing based frequency control and smoothing of PV and WTG output power variations in islanded micro-grid","authors":"Takahiro Uehara, Noor Ahmad Samim, T. Senjyu, M. Datta","doi":"10.1109/IFEEC.2015.7361453","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361453","url":null,"abstract":"Recently, penetration of renewable energy sources is remarkable. However, it causes system frequency deviation that means decrease of system reliability. In order to solve this problem, this paper proposes frequency control method using demand response (DR) and suppression of power output for renewable energy sources. It is assume that the consumption power of end-user is controlled automatically by smart appliances that decides the switch on/off using electric price. The electric price is given by real-time pricing method which is one of the DR methods. In addition, the suppression of power output for Photovoltaic Generator (PV) and Wind Generator (WG) is introduced. The suppression of power output for PV has been performed by controlling operating point, and that for WG is performed by controlling the pitch-angle of the blade. Furthermore, battery which has fast response characteristic is used, because the DR has slow response characteristic due to communication delay and mechanical delay. The effectiveness of the proposed method is verified by computer simulations.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126217309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, the significant impact of MHz switching frequency operation is demonstrated as effectively size reduction of boost inductor in the Continuous Conduction Mode (CCM) power factor correction (PFC) converter. To maintain high efficiency at MHz switching frequency, the gallium nitride high electron mobility transistor (GaN HEMT) is used to take place of the conventional silicon MOSFET in the 300W/1MHz CCM boost PFC converter. The experimental results validate the advantages of the GaN HEMT over the CoolMOS, achieving full load efficiency improvement of 1.2% and 2.1% respectively at 230VAC and 115VAC input condition. The detailed loss breakdown indicates that the GaN HEMT could reduce the switching loss substantially, the main loss under MHz PFC operation, so as to achieve efficiency improvement.
{"title":"Investigation of the MHz switching frequency PFC converter based on high-voltage GaN HEMT","authors":"Zhehui Guo, X. Ren, Qianhong Chen, Zhiliang Zhang, X. Ruan","doi":"10.1109/IFEEC.2015.7361394","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361394","url":null,"abstract":"In this paper, the significant impact of MHz switching frequency operation is demonstrated as effectively size reduction of boost inductor in the Continuous Conduction Mode (CCM) power factor correction (PFC) converter. To maintain high efficiency at MHz switching frequency, the gallium nitride high electron mobility transistor (GaN HEMT) is used to take place of the conventional silicon MOSFET in the 300W/1MHz CCM boost PFC converter. The experimental results validate the advantages of the GaN HEMT over the CoolMOS, achieving full load efficiency improvement of 1.2% and 2.1% respectively at 230VAC and 115VAC input condition. The detailed loss breakdown indicates that the GaN HEMT could reduce the switching loss substantially, the main loss under MHz PFC operation, so as to achieve efficiency improvement.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"50 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120820236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/IFEEC.2015.7361513
Yang-Sheng Shih, Chun-Lin Chen, M. Tsai
The technology developments for wind power generation have attracted wide attention over past decades. One of the most interested topics is variable speed control that enables a wind turbine system to achieve the optimal efficiency of power conversion from the aerodynamics to electricity. This paper presents a 2-DOF control scheme which can achieve a maximum power generation based on the continuously variable transmission and maximum power point tracking. The variable transmission composed with a planetary gear train is controlled by an electric motor to realize the optimal tip speed ratio. This transmission control ensures the maximum energy conversion from aerodynamics to mechanics. Furthermore, the power conversion in a DC generator is also controlled for tracking the maximum power point. Thus, this 2-DOF control scheme aims to obtain the maximum power generation of an overall wind turbine system.
{"title":"2-DOF control scheme for maximum power generation in wind turbine","authors":"Yang-Sheng Shih, Chun-Lin Chen, M. Tsai","doi":"10.1109/IFEEC.2015.7361513","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361513","url":null,"abstract":"The technology developments for wind power generation have attracted wide attention over past decades. One of the most interested topics is variable speed control that enables a wind turbine system to achieve the optimal efficiency of power conversion from the aerodynamics to electricity. This paper presents a 2-DOF control scheme which can achieve a maximum power generation based on the continuously variable transmission and maximum power point tracking. The variable transmission composed with a planetary gear train is controlled by an electric motor to realize the optimal tip speed ratio. This transmission control ensures the maximum energy conversion from aerodynamics to mechanics. Furthermore, the power conversion in a DC generator is also controlled for tracking the maximum power point. Thus, this 2-DOF control scheme aims to obtain the maximum power generation of an overall wind turbine system.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129921465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/IFEEC.2015.7361392
Huan Liu, Hui Zhang
Research and developments of in-wheel motors applied in micro all-electric vehicles have attracted great attention recently. The brushless DC (BLDC) motors have been widely used for these vehicles. A dual-mode operation of in-wheel Brushless DC motor driver for micro all-electric vehicle with position sensor mode or sensorless mode was proposed. The driver worked with position sensor mode under normal condition, but it would switch to the sensorless mode automatically once the position sensor was broken down or the signal wire got disconnected. The sensorless mode can be used as a backup mode in the driver. A dual-mode operation of BLDC motors for micro all-electric vehicle will enhance the reliability of the driver. Experimental results are given to verify the validity.
{"title":"Dual-mode operation of in-wheel brushless DC motor driver for micro all-electric vehicle","authors":"Huan Liu, Hui Zhang","doi":"10.1109/IFEEC.2015.7361392","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361392","url":null,"abstract":"Research and developments of in-wheel motors applied in micro all-electric vehicles have attracted great attention recently. The brushless DC (BLDC) motors have been widely used for these vehicles. A dual-mode operation of in-wheel Brushless DC motor driver for micro all-electric vehicle with position sensor mode or sensorless mode was proposed. The driver worked with position sensor mode under normal condition, but it would switch to the sensorless mode automatically once the position sensor was broken down or the signal wire got disconnected. The sensorless mode can be used as a backup mode in the driver. A dual-mode operation of BLDC motors for micro all-electric vehicle will enhance the reliability of the driver. Experimental results are given to verify the validity.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116203025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/IFEEC.2015.7361445
Yanping Zhu, Bingjie Liu, Xiaofeng Sun
Based on microgrid frequency, a new photovoltaic (PV)/ battery (BA)/ fuel cell (FC) hybrid energy management strategy with modified droop control for islanded application is proposed in this paper. This strategy enables the plug and play capability in the distributed units with voltage control mode and makes it possible to avoid using the communication line or a central supervisor. The system frequency working as the agent provides the units with the opportunities to adaptively maintain generation/load balance according to different situations with only local information. Simulation results are given to verify the effectiveness and advantages of the proposed strategy.
{"title":"Frequency-based power management for PV/battery/ fuel cell stand-alone microgrid","authors":"Yanping Zhu, Bingjie Liu, Xiaofeng Sun","doi":"10.1109/IFEEC.2015.7361445","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361445","url":null,"abstract":"Based on microgrid frequency, a new photovoltaic (PV)/ battery (BA)/ fuel cell (FC) hybrid energy management strategy with modified droop control for islanded application is proposed in this paper. This strategy enables the plug and play capability in the distributed units with voltage control mode and makes it possible to avoid using the communication line or a central supervisor. The system frequency working as the agent provides the units with the opportunities to adaptively maintain generation/load balance according to different situations with only local information. Simulation results are given to verify the effectiveness and advantages of the proposed strategy.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116491311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/IFEEC.2015.7361386
J. B. Wang, D. Kao
The loop gain profile of the DC/DC converter is affected by the loading effect of the other DC/DC converters in the parallel DC/DC converter system. As a result, the control performance of the paralleled DC/DC converters system might be deteriorated due to parallel impedance interference. In order to investigate the effect of the parallel impedance interference, the dynamic model of the parallel DC/DC converter system was build up via a general dynamic circuit scheme. From the analysis results, the impedance interference can be identified clearly. Some simulations and experimental results will provide to validate the aforementioned findings.
{"title":"Impedance interference investigation of the paralleled DC/DC converters system used droop current sharing control","authors":"J. B. Wang, D. Kao","doi":"10.1109/IFEEC.2015.7361386","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361386","url":null,"abstract":"The loop gain profile of the DC/DC converter is affected by the loading effect of the other DC/DC converters in the parallel DC/DC converter system. As a result, the control performance of the paralleled DC/DC converters system might be deteriorated due to parallel impedance interference. In order to investigate the effect of the parallel impedance interference, the dynamic model of the parallel DC/DC converter system was build up via a general dynamic circuit scheme. From the analysis results, the impedance interference can be identified clearly. Some simulations and experimental results will provide to validate the aforementioned findings.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114572001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/IFEEC.2015.7361457
Haruka Matsuo, Yoshiki Motoyama, A. Yasuda
Improving a torque ripple is one of the major challenges in the field of motors. There are several causes of a torque ripple. This paper focuses on an element value variation of a stator coil caused by a manufacturing defect. Based on a noise shaping dynamic element matching (NSDEM) technique to reduce the influence of variations by shuffling driving elements, a dynamic three-phase multi-coils-motor matching (DTMM) technique was proposed that shuffles the whole driving elements in a motor to reduce torque ripple. The results show that the proposed system reduces the torque ripple by 10% compared to the conventional driving technology.
{"title":"Realization of high precision multi-coils-motor","authors":"Haruka Matsuo, Yoshiki Motoyama, A. Yasuda","doi":"10.1109/IFEEC.2015.7361457","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361457","url":null,"abstract":"Improving a torque ripple is one of the major challenges in the field of motors. There are several causes of a torque ripple. This paper focuses on an element value variation of a stator coil caused by a manufacturing defect. Based on a noise shaping dynamic element matching (NSDEM) technique to reduce the influence of variations by shuffling driving elements, a dynamic three-phase multi-coils-motor matching (DTMM) technique was proposed that shuffles the whole driving elements in a motor to reduce torque ripple. The results show that the proposed system reduces the torque ripple by 10% compared to the conventional driving technology.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134552360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/IFEEC.2015.7361436
Xu Yu-zhen, Xu Sheng, Wang Xinze, L. Weiming
A simplified Photo-Electro model of high power LED is proposed in this paper. Theoretical derivation of this model and optical experiments are introduced . The variables of this model are forward voltage U and forward current Id, which can be easily obtained and controlled in LED drivers. The validity of this model is verified through two kinds of typical LED chips and the model is helpful to the LED driver design and the LED strategy study.
{"title":"A simplified photo-electro model for LED lighting","authors":"Xu Yu-zhen, Xu Sheng, Wang Xinze, L. Weiming","doi":"10.1109/IFEEC.2015.7361436","DOIUrl":"https://doi.org/10.1109/IFEEC.2015.7361436","url":null,"abstract":"A simplified Photo-Electro model of high power LED is proposed in this paper. Theoretical derivation of this model and optical experiments are introduced . The variables of this model are forward voltage U and forward current Id, which can be easily obtained and controlled in LED drivers. The validity of this model is verified through two kinds of typical LED chips and the model is helpful to the LED driver design and the LED strategy study.","PeriodicalId":268430,"journal":{"name":"2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124700209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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